<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
    *{margin: 0; 
    padding: 0;}

.box{
text-align: center;
margin-top: 100px;
}

@keyframes rotation{
from {-webkit-transform: rotate(0deg);}
to {-webkit-transform: rotate(360deg);}
}
.Rotation{
transform: rotate(360deg);
animation: rotation 3s linear infinite;
-moz-animation: rotation 3s linear infinite;
-webkit-animation: rotation 3s linear infinite;
-o-animation: rotation 3s linear infinite;
}

.img{border-radius: 50%;
}

</style>
</head>
<body>

<div class="box">
<img class="Rotation img" src="img/rong.jpg" width="500" height="500"/>
</div>

</body>
</html>